#include <stdbool.h>
#include <stdio.h>

int main() {
  bool digit_seen[10] = {0};

  int digit;
  long n;

  printf("Enter a number: ");
  scanf("%ld", &n);

  while (n > 0) {
    digit = n % 10;
    if (digit_seen[digit])
      break;
    digit_seen[digit] = true;

    n /= 10;
  }

  if (n > 0)
    printf("Repeated digit.\n");
  else
    printf("No repeated digit.\n");
    
  return 0;
}

// Enter a number: 28212